Bulk semiconductors; Energy resolutions; Exciton dynamics; Femtoseconds; Free carriers; Free excitons; Free-carrier dynamics; MeV energy; Two-dimensional electronic spectroscopies; Ultra-fast dynamics; Electronic, Optical and Magnetic Materials; Condensed Matter Physics
Résumé :
[en] We employ partially collinear two-dimensional electronic spectroscopy to disentangle precisely the ultrafast dynamics of excitons and free carriers in gallium selenide. Femtosecond temporal and meV energy resolution in the visible spectral region allows us to observe ultrafast bleaching at the exciton resonance with a relaxation time of 112 fs that corresponds to the thermal dissociation of excitons at room temperature, and is orders of magnitude faster than carrier relaxation in the bulk crystal. Our method is applicable to other functional materials, two-dimensional systems, and nanostructures.
Disciplines :
Physique
Auteur, co-auteur :
ALLERBECK, Jonas ; University of Luxembourg > Faculty of Science, Technology and Medicine > Department of Physics and Materials Science > Team Daniele BRIDA ; University of Konstanz, Konstanz, Germany
DECKERT, Thomas ; University of Luxembourg > Faculty of Science, Technology and Medicine (FSTM) > Department of Physics and Materials Science (DPHYMS)
Spitzner, Laurens; University of Konstanz, Konstanz, Germany
BRIDA, Daniele ; University of Luxembourg > Faculty of Science, Technology and Medicine (FSTM) > Department of Physics and Materials Science (DPHYMS) ; University of Konstanz, Konstanz, Germany
Co-auteurs externes :
yes
Langue du document :
Anglais
Titre :
Probing free-carrier and exciton dynamics in a bulk semiconductor with two-dimensional electronic spectroscopy
Deutsche Forschungsgemeinschaft European Regional Development Fund
Subventionnement (détails) :
We gratefully acknowledge scientific discussion with Dr. A. Leitenstorfer. This work was supported by the Emmy Noether Program of the DFG (Grant No. BR 5030/1-1) and the FEDER Program (Grant No. 2017-03-022-19 “Lux-Ultra-Fast”).
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